community[major], core[patch], langchain[patch], experimental[patch]: Create langchain-community (#14463)

Moved the following modules to new package langchain-community in a backwards compatible fashion:

```
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
mv langchain/langchain/adapters community/langchain_community
mv langchain/langchain/callbacks community/langchain_community/callbacks
mv langchain/langchain/chat_loaders community/langchain_community
mv langchain/langchain/chat_models community/langchain_community
mv langchain/langchain/document_loaders community/langchain_community
mv langchain/langchain/docstore community/langchain_community
mv langchain/langchain/document_transformers community/langchain_community
mv langchain/langchain/embeddings community/langchain_community
mv langchain/langchain/graphs community/langchain_community
mv langchain/langchain/llms community/langchain_community
mv langchain/langchain/memory/chat_message_histories community/langchain_community
mv langchain/langchain/retrievers community/langchain_community
mv langchain/langchain/storage community/langchain_community
mv langchain/langchain/tools community/langchain_community
mv langchain/langchain/utilities community/langchain_community
mv langchain/langchain/vectorstores community/langchain_community
mv langchain/langchain/agents/agent_toolkits community/langchain_community
mv langchain/langchain/cache.py community/langchain_community
```

Moved the following to core
```
mv langchain/langchain/utils/json_schema.py core/langchain_core/utils
mv langchain/langchain/utils/html.py core/langchain_core/utils
mv langchain/langchain/utils/strings.py core/langchain_core/utils
cat langchain/langchain/utils/env.py >> core/langchain_core/utils/env.py
rm langchain/langchain/utils/env.py
```

See .scripts/community_split/script_integrations.sh for all changes

libs/community/langchain_community/tools/office365/send_event.py

@@ -0,0 +1,85 @@
+"""Util that sends calendar events in Office 365.
+
+Free, but setup is required. See link below.
+https://learn.microsoft.com/en-us/graph/auth/
+"""
+
+from datetime import datetime as dt
+from typing import List, Optional, Type
+
+from langchain_core.callbacks import CallbackManagerForToolRun
+from langchain_core.pydantic_v1 import BaseModel, Field
+
+from langchain_community.tools.office365.base import O365BaseTool
+from langchain_community.tools.office365.utils import UTC_FORMAT
+
+
+class SendEventSchema(BaseModel):
+    """Input for CreateEvent Tool."""
+
+    body: str = Field(
+        ...,
+        description="The message body to include in the event.",
+    )
+    attendees: List[str] = Field(
+        ...,
+        description="The list of attendees for the event.",
+    )
+    subject: str = Field(
+        ...,
+        description="The subject of the event.",
+    )
+    start_datetime: str = Field(
+        description=" The start datetime for the event in the following format: "
+        ' YYYY-MM-DDTHH:MM:SS±hh:mm, where "T" separates the date and time '
+        " components, and the time zone offset is specified as ±hh:mm. "
+        ' For example: "2023-06-09T10:30:00+03:00" represents June 9th, '
+        " 2023, at 10:30 AM in a time zone with a positive offset of 3 "
+        " hours from Coordinated Universal Time (UTC).",
+    )
+    end_datetime: str = Field(
+        description=" The end datetime for the event in the following format: "
+        ' YYYY-MM-DDTHH:MM:SS±hh:mm, where "T" separates the date and time '
+        " components, and the time zone offset is specified as ±hh:mm. "
+        ' For example: "2023-06-09T10:30:00+03:00" represents June 9th, '
+        " 2023, at 10:30 AM in a time zone with a positive offset of 3 "
+        " hours from Coordinated Universal Time (UTC).",
+    )
+
+
+class O365SendEvent(O365BaseTool):
+    """Tool for sending calendar events in Office 365."""
+
+    name: str = "send_event"
+    description: str = (
+        "Use this tool to create and send an event with the provided event fields."
+    )
+    args_schema: Type[SendEventSchema] = SendEventSchema
+
+    def _run(
+        self,
+        body: str,
+        attendees: List[str],
+        subject: str,
+        start_datetime: str,
+        end_datetime: str,
+        run_manager: Optional[CallbackManagerForToolRun] = None,
+    ) -> str:
+        # Get calendar object
+        schedule = self.account.schedule()
+        calendar = schedule.get_default_calendar()
+
+        event = calendar.new_event()
+
+        event.body = body
+        event.subject = subject
+        event.start = dt.strptime(start_datetime, UTC_FORMAT)
+        event.end = dt.strptime(end_datetime, UTC_FORMAT)
+        for attendee in attendees:
+            event.attendees.add(attendee)
+
+        # TO-DO: Look into PytzUsageWarning
+        event.save()
+
+        output = "Event sent: " + str(event)
+        return output